/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.wlys.player.utils.imagecache;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;

import android.content.Context;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.text.TextUtils;

import com.wlys.player.utils.FunctionUtil;
import com.wlys.player.utils.logger.LogSubook;

/**
 * A simple subclass of {@link ImageResizer} that fetches and resizes images
 * fetched from a URL.
 */
public class ImageFetcher extends ImageResizer
{
    private static final String TAG = "ImageFetcher";
    private static int HTTP_CACHE_SIZE = 10 * 1024 * 1024; // 10MB
    public static final String HTTP_CACHE_DIR = "http";
    private static Context mContext;

    /**
     * Initialize providing a target image width and height for the processing
     * images.
     * 
     * @param context
     * @param imageWidth
     * @param imageHeight
     */
    public ImageFetcher(Context context, int imageWidth, int imageHeight)
    {
        super(context, imageWidth, imageHeight);
        init(context);
        mContext = context;
    }

    /**
     * Initialize providing a single target image size (used for both width and
     * height);
     * 
     * @param context
     * @param imageSize
     */
    public ImageFetcher(Context context, int imageSize)
    {
        super(context, imageSize);
        init(context);
        mContext = context;
    }

    private void init(Context context)
    {
        checkConnection(context);
    }

    /**
     * Simple network connection check.
     * 
     * @param context
     */
    private void checkConnection(Context context)
    {
        final ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        final NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo == null || !networkInfo.isConnectedOrConnecting())
        {
            // Toast.makeText(context, "No network connection found.",
            // Toast.LENGTH_LONG).show();
            LogSubook.e(TAG, "checkConnection - no connection found");
        }
    }

    /**
     * The main process method, which will be called by the ImageWorker in the
     * AsyncTask background thread.
     * 
     * @param data
     *            The data to load the bitmap, in this case, a regular http URL
     * @return The downloaded and resized bitmap
     */
    private Bitmap processBitmap(String data)
    {
        LogSubook.d(TAG, "processBitmap - " + data);

        // Download a bitmap, write it to a file
        final File f = downloadBitmap(mContext, data);

        if (f != null)
        {
            // Return a sampled down version
            return decodeSampledBitmapFromFile(f.toString(), mImageWidth,
                    mImageHeight);
        }

        return null;
    }

    @Override
    protected Bitmap processBitmap(Object data)
    {
        return processBitmap(String.valueOf(data));
    }

    /**
     * Download a bitmap from a URL, write it to a disk and return the File
     * pointer. This implementation uses a simple disk cache.
     * 
     * @param context
     *            The context to use
     * @param urlString
     *            The URL to fetch
     * @return A File pointing to the fetched bitmap
     */
    public static File downloadBitmap(Context context, String urlString)
    {
        File cacheDir = DiskLruCache.gethttpCacheDir(context,
                HTTP_CACHE_DIR);

        DiskLruCache cache = DiskLruCache.openCache(context, cacheDir,
                HTTP_CACHE_SIZE);
        if (cache == null)
        {
            cacheDir = DiskLruCache.getInternalDir(context, HTTP_CACHE_DIR);
            HTTP_CACHE_SIZE = 1024 * 1024 * 5;
            cache = DiskLruCache.openCache(context, cacheDir,
                    HTTP_CACHE_SIZE);
        }

        final File cacheFile = new File(cache.createFilePath(urlString));

        if (cache.containsKey(urlString))
        {
            LogSubook.d(TAG, "downloadBitmap - found in http cache - "
                    + urlString);
            return cacheFile;
        }

        LogSubook.d(TAG, "downloadBitmap - downloading - " + urlString);

        Utils.disableConnectionReuseIfNecessary();
        HttpURLConnection urlConnection = null;
        BufferedOutputStream out = null;

        try
        {
            final URL url = new URL(urlString);
            urlConnection = (HttpURLConnection) url.openConnection();
            String netType = FunctionUtil.getNetType(mContext);
            LogSubook.e("SubookApi", "++++++++++++++++++++++++++" + netType);
            if (!TextUtils.isEmpty(netType)
                    && netType.toLowerCase().equals(FunctionUtil.HTTP_WAP))
            {
                Proxy proxy = new Proxy(java.net.Proxy.Type.HTTP,
                        new InetSocketAddress("10.0.0.172", 80));
                urlConnection = (HttpURLConnection) url.openConnection(proxy);
            }

            final InputStream in = new BufferedInputStream(
                    urlConnection.getInputStream(), Utils.IO_BUFFER_SIZE);
            out = new BufferedOutputStream(new FileOutputStream(cacheFile
                    + ".temp"), Utils.IO_BUFFER_SIZE);

            int b;
            while ((b = in.read()) != -1)
            {
                out.write(b);
            }

            if (new File(cacheFile + ".temp").exists())
            {
                new File(cacheFile + ".temp").renameTo(cacheFile);
            }

            return cacheFile;

        }
        catch (final IOException e)
        {
            LogSubook.e(TAG, "Error in downloadBitmap - " + e);
        }
        finally
        {
            if (urlConnection != null)
            {
                urlConnection.disconnect();
            }
            if (out != null)
            {
                try
                {
                    out.close();
                }
                catch (final IOException e)
                {
                    LogSubook.e(TAG, "Error in downloadBitmap - " + e);
                }
            }
        }

        return null;
    }
}
